What is push service?

I have to execute two testcases :
Host has 1 IP and push services
Host has 2 Ips and push service that uses both on same port

what is push service here ?
How can I test these test cases ?
Please suggest !

It’s not that clear what the exact use-case is here, are you running those services through Rancher? And you need those to be externally reachable? Maybe a little diagram and workflow would help to understand it.